Tl;dr: It's a room filled with a multitude of different devices. Some of these devices read your mind and see if you're lying or not, and the others hit you with sound waves that can do anything from irritating you to throwing you to a wall.

I don't usually go line-by-line for first drafts, but this seems pretty close to finished (and it's mercifully short) and there aren't any major conceptual problems here, so I'll bite.

that used to be operated by former Foundation GOI Gru Divison ''P'' print to its disbandment.

You'll have to capitalize GRU (I don't know if that's the Russian custom, but we're treating it as a regular initialism for our purposes) and in the strictest in-universe sense, they're not a "Foundation GOI". You, the author, are the Foundation. They are a group you are interested in. They are GRU Division "P", a known Group of Interest to the Foundation. This is a nitpick more than anything.

The frequency at which the devices operate at can be altered, ranging from a low-frequency sound capable of irritating the mind of a subject to sound waves capable of throwing a subject around the room.

Not for nothing, but that's super casual science fiction. You can do science fiction here, obviously, but the Foundation would likely make more of a substantive note if they discovered a sound machine with telekinetic powers. I would just emphasize this as something that the fictional author of this document knows is sort of, y'know, weird.

Using the results of what has been dubbed the ''brain scan'',

I would probably just say "Using these results," since it is a brain scan. Quotation marks like that are what we usually call "scare quotes", where something is put in quotation marks that just seems like it should be able to hang out by itself as a statement. A device scans the brain. We don't have to dub it anything. It's a brain scan.

If the subject is lying, they will immediately be hit with a sonic wave operating at whatever frequency of sound was chosen by the operator.

I would imagine that it's more that the operator just chooses to hit them. This makes it sound like the device reads the operator's mind and "immediately" responds with whatever frequency they want. This is basically a torture chamber with sonic telekinesis.

Actually, that's the main takeaway of this. This is a torture chamber with sonic telekinesis. There's nothing wrong with that, but I would probably suggest that you play into the story more. The item itself is relatively simple, but it's fascinating (and almost stereotypical) that Russians would get ahold of a magic sound machine and use it for torture. And then, instead of coming up with more creative torture methods, they just developed a more sophisticated way of beating the absolute shit out of people. I love that as a concept.

It's not common for me to say anymore, but if anything, this could probably stand to have a little more added to it. You have the base object, which works. I wouldn't recommend testing logs or anything, because the real plus of this is that it's simple, but makes perfect sense in the rationale of Division P. I just feel like you should have a little something else. If I were spitballing ideas, I would say any of the following:

1. The Foundation comes in and finds a) all the personnel in the control room, dead and rotting, and b) something in the test chamber that appears to have come from a human, but is unusual some how. An impossible amount of blood? An enormous chair with straps? Something happened here a long time ago, and it was just left rather than being cleaned up.

2. The Foundation comes in and finds a scrap of paper from a journal written by one of the personnel from the control room, complaining about the low-tech nature of the technology, which is literal magic, so it's like, what was he expecting? What did Division P have in the 1960s that we still don't know about?

3. The Foundation comes in and can determine that the echo chamber was used for torture because of the blood stains on the walls…but there are identical blood stains in the control room? Who killed the torturers with their own devices? And how?

These are just examples of little hooks you can put into an article with relatively little effort. I really like how short and simple this is, and that will appeal to readers as well. But you need just a little more than "there was a torture room here"; I want to know something, even brief, about what happened here that should be of interest to me.

Just thoughts. I like it so far, and I like where it's going. I just think it needs to go a little farther before it's finished.